Self-adjusting ladder leveling device
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0970489
(2008-01-07)
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등록번호 |
US-8360204
(2013-01-29)
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발명자
/ 주소 |
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
6 |
초록
▼
A self-adjusting ladder leveling device includes a first locking member attached to the ladder, and a second locking member movably associated with the first locking member. First and second legs extend outwardly from the second locking member toward a supporting surface. The second locking member s
A self-adjusting ladder leveling device includes a first locking member attached to the ladder, and a second locking member movably associated with the first locking member. First and second legs extend outwardly from the second locking member toward a supporting surface. The second locking member slidably moves in relation to the first locking member as either the first or second leg is engaged with the surface. When both the first and second legs are engaged with the surface, the second locking member is moved into locked engagement with the first locking member, so as to maintain the ladder in a level state. When the first and/or second leg is removed from engagement with the supporting surface, the second locking member is released and is free to move with respect to the first locking member again.
대표청구항
▼
1. A self-adjusting leveling ladder comprising: first and second generally parallel and interconnected side rails;third and fourth generally parallel side rails connected by a plurality of step rungs spaced apart from one another along a length of the third and fourth side rails, the third and fourt
1. A self-adjusting leveling ladder comprising: first and second generally parallel and interconnected side rails;third and fourth generally parallel side rails connected by a plurality of step rungs spaced apart from one another along a length of the third and fourth side rails, the third and fourth side rails being pivotally connected to the first and second side rails so as to form an A-frame step ladder;a first locking member extending between the first and second side rails and having a plurality of spaced apart projections extending substantially a length of the first locking member;a second locking member associated with the first locking member so as to slidably move along a substantial length of the first locking member;a first leg having a first end pivotally attached to the second locking member and with a longitudinal axis extending downwardly from the second locking member at an angle; anda second leg having a first end pivotally attached to the second locking member and with a longitudinal axis extending downwardly from the second locking member at an angle; andthe first locking member extends through a passageway formed in the second locking member, the second locking member is configured to freely slide horizontally along a length of the first locking member when one of the first leg and the second leg is exerting a force to the second locking member, and move vertically into releasable engagement with the first locking member when the first and second legs exert an upward force to the second locking member; anda first guide associated with the first rail for guiding a movement of the first leg within the first guide, and a second guide associated with the second rail for guiding a movement of the second leg within the second guide. 2. The self-adjusting ladder of claim 1, wherein the spaced apart projections of the first locking member are disposed in an open-faced channel facing at least a portion of the second locking member. 3. The self-adjusting ladder of claim 1, wherein the second locking member includes at least one projection configured to be inserted between the spaced apart projections of the first locking member so as to lock the first and second locking members into engagement with one another and prevent the second locking member from slidably moving along the length of the first locking member. 4. The self-adjusting ladder of claim 1, including first and second stops to limit a horizontal movement of the second locking member. 5. The self-adjusting ladder of claim 1, wherein the first and second guides each include a cylindrical member in spaced relation to the first or second rail. 6. The self-adjusting ladder of claim 5, wherein the first leg is disposed between the cylindrical member of the first guide and the first rail of the first guide, and the second leg is disposed between the cylindrical member of the second guide and the second rail of the second guide. 7. The self-adjusting ladder of claim 1, including a surface-engaging foot pivotally connected to a second end of the first leg and a second surface-engaging foot pivotally connected to a second end of the second leg. 8. The self-adjusting ladder of claim 1, wherein a second end of the first leg extends outward of a longitudinal axis of the first rail and a second end of the second leg extends outward of a longitudinal axis of the second rail, such that there is a greater distance between the second ends of the first and second legs than a distance between the first and second rails. 9. A self-adjusting leveling ladder comprising: first and second generally parallel and interconnected side rails;third and fourth generally parallel side rails connected by a plurality of step rungs spaced apart from one another along a length of the third and fourth side rails, the third and fourth side rails being pivotally connected to the first and second side rails so as to form an A-frame step ladder;a first locking member comprising a generally horizontally oriented cross bar extending between the first and second side rails;a second locking member slidably attached to the first locking member so as to slide along a substantial length of the first locking member;a first leg having a first end pivotally attached to the second locking member and with a longitudinal axis extending downwardly from the second locking member at an angle;a second leg having a first end pivotally attached to the second locking member and with a longitudinal axis extending downwardly from the second locking member at a non-perpendicular angle;a first guide associated with the first rail and the first leg for guiding a movement of the first leg; anda second guide associated with the second rail and the second leg for guiding a movement of the second leg;wherein the second locking member is configured to freely slide horizontally along a length of the first locking member when one of the first leg and the second leg is exerting a force to the second locking member, and move vertically into engagement with the first locking member when both the first and second legs exert an upward force to the second locking member;wherein the first locking member includes an open-faced channel having a plurality of spaced apart projections disposed therein and extending substantially a length of the open-faced channel, wherein the second locking member includes at least one projection configured to be inserted between the spaced apart projections of the first locking member so as to lock the first and second locking members into engagement with one another and prevent the second locking member from moving horizontally along a length of the first locking member; andwherein the first guide includes a first cylindrical member in spaced relation to the first rail, the first leg being disposed between the first rail and the first cylindrical member for guiding a movement of the first leg within and along the first guide, and the second guide includes a second cylindrical member in spaced relation to the second rail, the second leg being disposed between the second rail and the second cylindrical member for guiding a movement of the second leg within and along the second guide. 10. The self-adjusting ladder of claim 9, including first and second stops to limit the horizontal movement of the second locking member. 11. The self-adjusting ladder of claim 9, including a surface-engaging foot pivotally connected to a second end of the first leg and a second surface-engaging foot pivotally connected to a second end of the second leg. 12. The self-adjusting ladder of claim 9, wherein a second end of the first leg extends outward of a longitudinal axis of the first rail and a second end of the second leg extends outward of a longitudinal axis of the second rail, such that there is a greater distance between the second ends of the first and second legs than a distance between the first and second rails. 13. The self-adjusting ladder of claim 9, wherein the first locking member extends through a passageway formed in the second locking member. 14. A self-adjusting leveling ladder comprising: first and second generally parallel and interconnected side rails;third and fourth generally parallel side rails connected by a plurality of step rungs spaced apart from one another along a length of the third and fourth side rails, the third and fourth side rails being pivotally connected to the first and second side rails so as to form an A-frame step ladder;a first locking member comprising a generally horizontally oriented cross bar extending between the first and second side rails and defining an open-faced channel having a plurality of spaced apart projections extending substantially a length of the first locking member;a second locking member slidably attached to the first locking member;a first leg having a first end pivotally attached to the second locking member and with a longitudinal axis extending downwardly from the second locking member at an angle so as to extend outwardly of a longitudinal axis of the first rail;a surface-engaging foot pivotally connected to a second end of the first leg;a second leg having a first end pivotally attached to the second locking member and with a longitudinal axis extending downwardly from the second locking member at an angle so as to extend outwardly of a longitudinal axis of the second rail, a distance between a second end of the first leg and a second end of the second leg being greater than a distance between the first and second rails;a second surface-engaging foot pivotally connected to the second end of the second leg;a first guide associated with the first rail and the first leg for guiding a movement of the first leg within and along the first guide; anda second guide associated with the second rail and the second leg for guiding a movement of the second leg within and along the second guide;wherein the second locking member is configured to slide horizontally along a length of the first locking member when one of the first leg and the second leg is exerting a force to the second locking member, and move vertically into engagement with the first locking member such that at least one projection of the second locking member is inserted between the first locking member projections to prevent horizontal movement of the second locking member when both the first and second legs exert an upward force to the second locking member. 15. The self-adjusting ladder of claim 14, including first and second stops to limit the horizontal movement of the second locking member. 16. The self-adjusting ladder of claim 14, wherein the first guide includes a first cylindrical member in spaced relation to the first rail, the first leg being disposed between the first rail and the first cylindrical member, and the second guide includes a second cylindrical member in spaced relation to the second rail, the second leg being disposed between the second rail and the second cylindrical member. 17. The self-adjusting ladder of claim 14, wherein the first locking member extends through a passageway formed in the second locking member.
이 특허에 인용된 특허 (6)
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Ferguson William H. (18 Graham Crescent ; Bainfield Estate Cardross ; Dunbartonshire GB3 G82 5Jh), Ladder levelling device.
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Martin C. Dennis CA, Ladder levelling device.
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Coutts Ian B. (20 Kildare St. Burwood ; Victoria AUX 3125), Ladders leveling device.
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Hodson Baden L. (29 Stirling Street Enoggera ; Queensland 4051 AUX), Levelling device for ladders.
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Lees, Sydney John, Self-leveling support.
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Capers, Jr.,Seth Murph; Capers,Seth Murphy, Self-leveling wheelbarrow.
이 특허를 인용한 특허 (1)
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Worthington, Gary Landon, Automatic locking system for a self-adjustable leveling ladder.
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